💊 Cancer-Related Fatigue Mechanism Simulator

Baseline — Multiple Factors Present at Once

Cancer fatigue rarely has one cause — several act together.

• 4: Contributing factors (inflammation, anemia, sleep, distress)
• up to 90%: Prevalence in patients (during active treatment)
• early: Onset (often before other symptoms)
• rare: Single-cause cases (usually multifactorial)

Tumor and treatment-driven inflammation

Placeholder: tumor and chemo raise circulating cytokines.

Anemia from disease and chemotherapy

Placeholder: chemo and marrow involvement lower hemoglobin.

Sleep and psychological burden

Placeholder: symptoms and anxiety disrupt normal sleep.

Each Factor Adds Its Own Share

Every active factor independently raises overall fatigue burden.

• ~25%: Inflammation share (of total burden)
• ~20%: Anemia share (of total burden)
• ~20%: Sleep share (of total burden)
• ~18%: Distress share (of total burden)

Cytokine signaling to the brain

Placeholder: IL-6 and TNF-α signal fatigue centrally.

Reduced oxygen delivery from anemia

Placeholder: low hemoglobin limits tissue oxygen delivery.

Additive, not mutually exclusive, effects

Placeholder: contributions simply stack toward total fatigue.

Factors Amplify Each Other Over Time

Poor sleep worsens distress, which worsens perceived fatigue further.

• +9%: Sleep–distress bonus (added burden when both active)
• +5%: Inflammation–distress bonus (mood-cytokine interaction)
• +5%: Anemia–inflammation bonus (synergistic fatigue signal)
• 3: Compounding pairs modeled (key interactions)

Sleep loss feeding psychological distress

Placeholder: disrupted sleep intensifies anxiety and low mood.

Distress amplifying inflammatory signaling

Placeholder: stress pathways can further raise cytokine levels.

Feedback loops sustain elevated fatigue

Placeholder: interacting factors keep fatigue burden persistently high.

Interventions Target Specific Contributing Factors

Correcting one factor alone rarely resolves the whole picture.

• transfusion / ESA: Anemia correction (raises hemoglobin)
• hygiene / CBT-I: Sleep treatment (restores restorative sleep)
• counseling: Psychological support (reduces distress signal)
• paradoxical benefit: Exercise effect (lowers fatigue despite effort)

Anemia correction via transfusion or ESA

Placeholder: raising hemoglobin restores tissue oxygen delivery.

Sleep hygiene and behavioral therapy

Placeholder: structured sleep treatment reduces one contributor.

Exercise despite feeling counterintuitive

Placeholder: gentle activity paradoxically lowers cancer fatigue.

Treating Multiple Factors Together Works Best

Combined management outperforms any single-factor approach alone.

• modest: Single-factor improvement (partial fatigue relief)
• largest: Multi-factor improvement (best overall relief)
• combined care: Recommended approach (multidisciplinary team)
• multifactorial: Key principle (no single fix suffices)

Why single-target treatment underperforms

Placeholder: remaining active factors keep burden elevated.

Combined multidisciplinary management

Placeholder: addressing all factors together maximizes improvement.

Practical takeaway for care teams

Placeholder: screen and treat every contributing factor jointly.